/Engine/Source/Editor/UnrealEd/Public/EditorLevelUtils.h
Delegate used byMoveActorsToLevel()to check whether an actor can be moved
typedef TMulticastDelegate_ThreeParams< void, const [AActor](API\Runtime\Engine\GameFramework\AActor) *, const [ULevel](API\Runtime\Engine\Engine\ULevel) *, bool & > FCanMoveActorToLevelDelegate